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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290

Abstract

SOUZA, Maria Luiza Rodrigues de et al. Effect of tanning technique and methods used for skin removal on leather resistance characteristics of Nile Tilapia. R. Bras. Zootec. [online]. 2006, vol.35, n.4, pp.1273-1280. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35982006000500004.

This research evaluated the effect of different methods (fillet skin removal and tanning methods [with or without chromium salts and bioleather]) on leather resistance characteristics of Nile Tilapia (Oreochromis niloticus). Skin from 40 tilapias (450 g) were removed: 20 by pliers and 20 by machine. After skin tanning, the samples were removed for resistance tests, which were done, in a climatized environment (23ºC) and 50% air relative humidity, with EMIC dynamometer, at removal speed of 100 ± 20 mm/mm. No effect of fillet skin removal method on progressive tearing and strength was observed. The method of skin removal by machine resulted in greater (88.48%) elongation than that removed by pliers (71.09%). Skin tanned with chromium salts (25.54 N/mm; 12.18N/mm2) had higher resistance than that tanned without chromium (bioleather) (13.11 N/mm; 9.89 N/mm2). Chromium- and bioleather tanned skins may be used in clothes manufacture since average values of strength, elongation and progresive tearing are higher than 9.80N/mm², 60% and 14.72 N/mm, respectively, which are values recommended for leathers tanned with chromium salts.

Keywords : bioleather skin; fillet skin removal; physical and mechanical tests; skin quality; skin resistance.

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